Nut-lock.



No. 893,567. PATENTED JULY 14, 1908.

J. H. 'BURROWS. I

NUT LOOK. APPLICATION FILED-MAB, 4. 190a.

Inventor.- b J0sqzrhflllur ows P flZZj/s.

UNITED STATES PATENT orrion JOSEPH H. BURROWS, OF BROCKTON,MASSACHUSETTS, ASSIGNOR TO BURROWS LOCK-NUT- & BOLT COMPANY, OF BEVERLY,MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

NUT-LOCK.

Specification of Letters Patent.

Patented July 14, 1908.

To all whom it may concern:

Be it known that I, JOSEPH H. BURROWS, a citizen of the United States,residing at Brockton, in the county of Plymouth, State,

of Massachusetts, have invented an Improve- 1116115111 Nut-Locks, ofwhich the following description, in connection with the accompanyingdrawings, is a specification, like nuwith which the nut is engaged, toprevent the removal of the bolt from the nut, the key and the recesshaving interengaging members, all of which permits an endwise rockingmovement of the key, so that it may be swung inwardly toward the bolt toindent the thread thereof, and outwardly from the bolt to release thethread and to permit the removal of the nut.

One object of the invention is to provide improved means forestablishing a loose looking engagement between the key and the bottomof the cavity, which shall permit the necessary rocking movement of thekey, and at the same time prevent the removal of the key from thecavity.

Another object of the invention is to enable the key to be rocked to andfrom its locking position by force applied to the key outside of thecavity, so that the key may be rocked without the employment of aspecial tool adapted to enter the cavity.

My invention will be best understood by reference to the followingdescription, taken in connection with the accompanying illustration ofone specific embodiment thereof, while its scope will be pointed out inthe appended claims.-

Of the accompanying drawings forming a part of thisspecification,-Figure 1 represents a sectional view of a nut providedwith a cavity adapted to contain a locking key, the cavity having akey-engaging member embodying a portion of my invention; Fig.

2 represents a side view of the key which is to be inserted in thecavity shown in Fig. 1; Fig. 3 represents an edge view of the key; Fig.4 represents a sectional view of a portion of the nut showing the key inits locking position in the cavity of the nut, Fig. 5 repthan the outerend of the stud member.

key rocked to its unlocking position; Fig. 6 represents an end view ofthe portion of the nut which contains the cavity; and Figs. 7 and 8represent views showing slight varia tions in the form of the socketmember in the key.

The same numerals of reference indicate the same parts in all thefigures.

In the drawings 12 represents a nut having the usual threaded bolt hole13, and having also a slot-shaped cavity 14, one end of which is openedinto the bolt hole and the top of which opens through the exterior upperface of the nut.

15 represents a stud member which projects upwardly from the bottom ofthe cavity 14, and is preferably formed as aweb, with the nut, andextends across the cavity, as shown in Fig. 6.

16 represents a locking key, which is inserted in the cavity 14, and issharpened at its inner end to form a cutting edge 17, adapted to indentthe thread of a bolt with which the nut is engaged. The lower edgeportion of the key is provided with a socket portion 18, which is formedto have a loose rocking engagement with the member 15, the form of saidmember being such that the key is adapted to stand in the lockingposition shown in Fig. 4, with its cutting edge indenting the boltthread, or in the unlocking position shown in Fig. 5, with its cuttingedge withdrawn from the bolt. The width of the outer end of the studmember 15 is greater than that of the inner end or base portion of thestud member. The socket portion 18 has a contracted mouth, which isnarro ilv ler 1e inner end of the socket portion is considerably widerthan the wider outer end of the stud member, the proportions andrelative engagement ofthe stud member and socket portion being such thatthe widened inner end of the socket portion permits the key to rock onthe stud member, while the widened outer end of the stud member and thecontracted mouth of the socket portion prevent the removal of the keyfrom the cavity 14.

In practice the widening of the outer end of the stud member ispreferably effected by the upsetting of the upper end or edge of thestud member, which is upset from its form or shape shown in Fig. 1 tothat shown in Fig. 4, by the pressure of the inner wall of resents aview similar to Fig. 4, showing the I the socket portion which isdirected to cause the stud member to swell out within the widenedportion of the socket to a greater width than the narrow width of thesocket. This pressure is caused by driving the key downwardly into thecavity 14 in the direction indicated by the arrow in Fig. 4, the innerwall of the socket member being thus caused to bear upon the upper edge19, of the stud and force the same outwardly, thus augmenting the widthof the outer end of the stud member, and causing the width of said.outer end to exceed. the width of the contracted. mouth of the socket.Care is taken, however, to have the width of the inner end of the socketexceed the augmented width of the outer end of the stud member, so thatnotwithstanding the said augmentation, the key is adapted to rock on thestud member. The initial or original height of the stud will of coursebe selected sufficiently in excess of the depth of the socket torpermitthe needed augmentation of its upper end when upset, all with referenceto the other proportions of the several cooperating parts.

' It will be seen from the foregoing that provision is made for looselylocking the key to the nut by the act of forcing it into the cavity 14c,the loose locking of the key being effected wholly by complementalmembers provided at the bottom portion of the cavity at the inner edgeportion of the key. Heretofore in nut locks of this character, theremoval of the key from the cavity has been by indenting or upsettingportions of the outer surface of the nut at opposite sides of thecavity, to cause said portions to overhang the key, and contract themouth of the cavity. This contraction of the mouth of the cavity isobjectionable because it inter-v feres with the free rocking movementsof the key, an objection which is entirely overcome by my inventionabove described. The outer side 20 of the socket 18 is made shorter thanthe inner side 21, to permit the rocking of the key from its looking toits unlocking position, as clearly illustrated in Figs. 4- and 5.

The width of the key is such that its outer edge projects above theouter face of the nut, and is therefore adapted to be engaged by ahammer or other like tool, applied to the key outside of the cavity 14.Heretofore in nut locks of this character, it has been necessary to formthe key so that itsouter edge is with in the outer face of the nut, inorder that the key may be retained by upsetting portions of the outerface of the nut, and contracting the mouth of the cavity, as abovedescribed. It has therefore been necessary heretofore to apply pressureto the key by means of a special tool, such as a nail set, having anarrow end adapted to enter the mouth of .the cavity, and bear upon theouter edgeof the key within the cavity. It will be seen that theextension of the key outside the cavity,

which is made feasible by the loose interlocking ofthe inner portion ofthe key with the.

bottom of the cavity, enables any convenient driving tool, such as ahammer, to be used in rocking the key, the shape of the driving toolbeing immaterial, so that a tool of much greater width than the width ofthe cavity may be employed.

I prefer to provide the projecting portion of the key with aprotuberance 23, presenting a sloping or beveled portion 24 which facesoutwardly from the bolt hole and enables a hammer to be appliedconveniently to the key in the direction indicated by the arrow in Fig.5. The outer portion 25 of the upper edge of the key also projects abovethe outer face of the nut, and forms a bearing for a hammer applied inthe direction required to rock the key to its unlocking position.

As shown in Fig. 3, the transverse dimension or the thickness of the keyis substan tially the same as the width of the slot or cavity 14, sothat the key enters the cavity with a driving fit. The resultantfriction upon the flat faces of the key, therefore, acts to hold thesame in engagement with the bolt threads when driven into engagementtherewith, and also to hold the key tipped back into the position shownin Fig. 5 when rocked out of engagement therewith.

My invention is not limited to the particular form of the interlockingmembers of the key and nut here shown, as the same may be variouslymodified without departing from the spirit of the invention. In Figs. 7and 8 I show modified forms of the inner end of the socket member 18 ofthe key.

Claims.

1. Anut having a slot-shaped cavity opening into the bolt hole and alsoupon the exterior surface of the nut, and a thread-indenting keyinserted in said cavity, the inner edge portion of the key and thebottom of the cavity having interlocking but loosely fitting members,one upon the nut and the other upon the key, which permit the endwiserocking of the key without necessary deformation of the sameinterlocking members, and prevent the removal of the key from thecavity.

2. A nut having a slot-shaped cavity opening into the bolt hole and alsoupon the exterior surface of the nut, a stud member projecting outwardlyfrom the bottom of the cavity, and a thread-indenting key inserted inthe cavity, and having an edge provided with a socket loosely engagedwith the stud member, the stud and socket being formed to prevent theremoval of the key from the cavity, but to permit the key to rockendwise therein without necessary deformation of the stud.

3. A nut having a cavity opening into the bolt hole, a stud memberprojecting outwardly from the bottom of the cavity, and of greater widthat its cuter than at its inner end, and a thread-indenting key insertedin the cavity and provided with a socket loosely engaging the stud ofthe cavity and having a contracted mouth which is narrower than theouter end of the stud member, and an inner end which is wider than theouter end of the stud member, whereby endwise rocking of the key ispermitted, and its removal from the cavity is prevented.

i. A nut having a slot-shaped cavity opening into the bolt hole and alsoupon the eX terior surface of the nut, and a threadin denting keyinserted in said cavity, and projecting outwardly from the mouth of thelat ter, for engagement with a driving tool, the inner edge portion ofthe key and the bottom of the cavity having interengaged but looselyfitting members which permit the endwise rocking of the key withoutnecessary deformation of the said members.

5. A nut having a slot-shaped cavity opening into the bolt hole and alsoupon the eX- terior surface of the nut, and a thread-indenting keyinserted in said cavity, and projecting outwardly from the mouth of thelatter for engagement with the driving tool, the inner edge portion ofthe key and the bottom of the cavity having interengaged but looselyfitting members which permit endwise rocking of the key withoutnecessary deformation of said members, and prevents the removal of thekey from the cavity.

6. A nut having a slot-shaped cavity opening into a bolt hole and alsoupon the eX- terior surface of the nut, a thread-indenting key insertedin said cavity, said key having means providing for a rocking engagementwith the nut said means comprising a cooperating socket and stud member,one upon the edge of the key and the other upon the bottom of theslot-shaped cavity and hav ing a thread-indenting edge adapted to engagethe threads of the bolt to lock the same in position when the key isdriven forward about its fulcrum point, said key being proportioned whenin its interlocked position to present a projecting portion outside thelimits of said cavity and at the opposite side of the fulcrum from theindenting edge, whereby the said projecting portion may be struckby asuitable tool and the key rocked endwise to an unlocking position.

In testimony whereof, I have signed my name to this specification, inthe presence of two subscribing witnesses.

JOSEPH H. BURROVVS.

Witnesses:

CHARLES H. BooTHBY, THOMAS B. BOOTH.

